![Philadelphia Police officers in 1969, just a few years after they started using the phrase "Black Friday." | Police, Philly, Military police Philadelphia Police officers in 1969, just a few years after they started using the phrase "Black Friday." | Police, Philly, Military police](https://i.pinimg.com/736x/be/18/c7/be18c7291738484476517befc4382021.jpg)
Philadelphia Police officers in 1969, just a few years after they started using the phrase "Black Friday." | Police, Philly, Military police
![British Police Hist. on Twitter: "In our fourth issue, read how the Metropolitan #Police #uniform would significantly change in the late 1960s from "the Bather" uniform as worn by these #WPCs to British Police Hist. on Twitter: "In our fourth issue, read how the Metropolitan #Police #uniform would significantly change in the late 1960s from "the Bather" uniform as worn by these #WPCs to](https://pbs.twimg.com/media/EDYVrOdW4AAhIMw.jpg)
British Police Hist. on Twitter: "In our fourth issue, read how the Metropolitan #Police #uniform would significantly change in the late 1960s from "the Bather" uniform as worn by these #WPCs to
![1960 | US Air Force Security Forces | Virtual Museum | Memorial | Military Police | USAF | SP | AP | SF - USAF Police Alumni Association 1960 | US Air Force Security Forces | Virtual Museum | Memorial | Military Police | USAF | SP | AP | SF - USAF Police Alumni Association](https://www.usafpolice.org/uploads/3/8/2/1/38210033/7721646.jpg)